Final answer:
The quick command button to locate the help screen in many applications and operating systems is the F1 key.
Step-by-step explanation:
The quick command button to locate the help screen in many software applications and operating systems is F1. When you press the F1 key on your keyboard, it typically opens the help menu or support documentation for the program you're currently using. This is a standardized keyboard shortcut in Windows environment and many others, making it a helpful command to remember. To use this, simply ensure that you're in the application you need help with, and then press the F1 key. No other keys need to be held down in conjunction with F1 to access help resources.